US 11,840,666 B1
Method to attenuate acid reactivity of subterranean formations with omniphobic chemicals
Mohammed Sayed, Katy, TX (US); Rajesh Saini, Cypress, TX (US); Fakuen Frank Chang, Houston, TX (US); and Amy J. Cairns, Houston, TX (US)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by ARAMCO SERVICES COMPANY, Houston, TX (US)
Filed on Aug. 2, 2022, as Appl. No. 17/816,795.
Int. Cl. C09K 8/74 (2006.01); E21B 43/27 (2006.01); C09K 8/60 (2006.01); C09K 8/72 (2006.01)
CPC C09K 8/74 (2013.01) [C09K 8/604 (2013.01); C09K 8/725 (2013.01); E21B 43/27 (2020.05)] 15 Claims
OG exemplary drawing
 
1. A formation treatment composition comprising:
an aqueous fluid;
an acid; and
at least one omniphobic fluorochemical configured to form an omniphobic fluorochemical barrier on a rock matrix, and wherein the omniphobic fluorochemical barrier is configured to mitigate a reaction between the rock matrix and the acid,
wherein the formation treatment composition comprises the acid in a range from 10 wt % to 70 wt % based on the total weight of the formation treatment composition,
wherein the acid is selected from the group consisting of hydrochloric acid, methanesulfonic acid, and combinations thereof, and
wherein the at least one omniphobic fluorochemical is water soluble and is selected from the group consisting of a nonionic acrylic fluorinated copolymer, a nonionic fluorinated surfactant, partially fluorinated acrylic copolymer, a nonionic fluorinated methacrylate polymer, an anionic phosphate fluorinated surfactant, an anionic sulfate fluorinated surfactant, and combinations thereof.